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Problem Report 0802 Details

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Report 0802 Actions

    Problem Report Number 0802
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.0317
    Raised 1970-01-01 08:00
    Updated 2003-03-13 08:00
    Published 1996-11-01 08:00
    Product Standard Commands and Utilities V2 (UNIX 95)
    Certification Program The Open Brand certification program
    Test Suite VSC version 4.1.6
    Test Identification POSIX.cmd/dd 30
    Problem Summary TSD4C.00194 This test may fail on implementations with printf commands that correctly parse \0000 as an octal representation of NULL.
    Problem Text
    Test 30, which tests:

    dd if=example2.txt ibs=10 obs=10 count=1 seek=1

    fails because the expected output, which is stored in a file the test creates,
    dd_eso_30_2, is specified incorrectly. It is missing an ASCII '0'.

    The output expected from dd, when using example2.txt as shown, is ten null bytes
    followed by ASCII zero through ASCII nine.

    The printf used to define the expected output is:

    printf "\000\000\000\000\000\000\000\000\000\0000123456789" > dd_eso_30_2

    This yields ten null bytes followed by ASCII one through ASCII nine, not ASCII
    zero through ASCII nine.

    The printf command used to create the expected output uses \0ddd format, which
    is defined on page 584 of the CAE Commands and Utilities Specification Issue 4,
    Version 2:

    -\0ddd, where ddd is a [SIC] zero-,one-,two- or three-digit octal number that
    will be converted to a byte with the numeric value specified by the
    octal number.

    Thus, the printf in question uses the \0dd format (\000) nine times to generate
    the first nine null bytes. The tenth byte is parsed as \0ddd format (\0000),
    treating the fourth '0' as part of the \0ddd construction, rather than as the
    first zero of the ASCII string zero through nine; the printf should have a
    fifth zero, specified before the ASCII one, to mark the start of the ASCII
    string. In other words, the printf should appear as follows:

    printf "\000\000\000\000\000\000\000\000\000\00000123456789" > dd_eso_30_2
    ^---- ASCII zero
    \0ddd format declaration of NULL ----^^^^^

    The fifth zero then falls after the specification of NULL, representing an ASCII
    zero as it should.

    Test Output
    520|88 1 28977 1 1|Assertion #30 (A): Verify \'dd (ibs|obs|cbs|bs)=expr\' works
    520|88 1 28977 1 2| <LC> with block.
    520|88 1 28977 1 11|Testing: if=example2.txt ibs=10 count=1
    520|88 1 28977 1 12|Testing: if=example2.txt ibs=10 obs=10 count=1 seek=1
    520|88 1 28977 1 13|Command failed: 'cmp dd_out_30_2 dd_eso_30_2 >/dev/null 2>&
    520|88 1 28977 1 14| <LC> 1'
    520|88 1 28977 1 15|Testing: if=example2.txt cbs=10 conv=block
    520|88 1 28977 1 16|Testing: if=example2.txt bs=10 count=1
    220|88 1 1 17:52:38|FAIL

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    We agree this is a test suite deficiency in the test
    suite version(s) listed.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Test Suite Deficiency (TSD)
    Review Conclusion
    This is an agreed Test Suite Deficiency.

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